The spectacled caiman is a Small and medium-sized crocodilian. Males of the species are generally 1.8 to 2 m (5.9 to 6.6 ft), while females are smaller, usually around 1.2–1.4 m (3.9–4.6 ft). The body mass of most adults is between 7 and 40 kg (15 and 88 lb). The maximum reported size for the species is 2.5 m (8.2 ft), with a body mass of 58 kg (128 lb) but they can growing up to 3 m in length potentially. The largest female was reportedly 1.61 m (5.3 ft) long and weighed 20 kg (44 lb). Caimans from the Venezuelan llanos are reportedly larger-bodied than specimens from Mexico.

The species’ common name comes from a bony ridge between the eyes, which gives the appearance of a pair of spectacles. Overall a typical crocodilian gray-green coloration, this species has been known to change color. During colder weather, the black pigment, found within their skin cells, will expand, making them appear darker. [credits: Wikipedia]